Assertion and Reason Structure of Atom Part 1

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Q (1): Assertion : The atomic masses of many elements are in fractions and not whole numbers.

Reason : The fractional atomic masses of elements are due to the existence of their isotopes having different masses.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (2): Assertion: Atom is electrically neutral.

Reason : A neutral particle, neutron is present in the nucleus of atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (3): Assertion : Cathode rays get deflected towards the positive plate of electric field.

Reason: Cathode rays consist negatively charged particles known as electrons.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (4): Assertion : In Rutherford's experiment, some of the alpha-particles deflect by large angles.

Reason: alpha-particles are much heavier than the protons.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (5): Assertion : Protium and deuterium are isotopes.

Reason: Isotopes have same mass numbers.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (6): Assertion: The number of electrons in the valence shell of helium atom is 2.

Reason: The valency of helium is 2.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (7): Assertion: Cathode rays travel in straight lines.

Reason: Cathode rays do not penetrate through thin sheets.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (8): Assertion : Atomic number is always equal to the number of electrons.

Reason: Atomic number doesn't change during a chemical reaction.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (9): Assertion : Calcium and argon are isobars.

Reason : Calcium and argon have same mass numbers.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (10): Assertion (A) : The number of valence electrons in oxygen atom is 6.

Reason (R): The valency of oxygen atom is 6.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (11): Assertion (A): Most of the alpha-particles in Rutherford's experiment passed straight through the gold foil.

Reason (R): The centre of the atom is positively charged.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (12): Assertion (A): All isotopes of a given element show the same type of chemical behaviour.

Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (13): Assertion: Atom is electrically neutral.

Reason: Equal number of protons and electrons are present in an atom

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (14): Assertion: Mass of an atom is the sum of its nucleons.

Reason: Protons and neutrons are present in the nucleus of an atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (15): Assertion: Inert elements show zero valency.

Reason: Atoms of inert element have fully filled outermost orbit.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

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